CN110342716B - Zero discharge system of desulfurization waste water of coal-fired plant - Google Patents
Zero discharge system of desulfurization waste water of coal-fired plant Download PDFInfo
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- CN110342716B CN110342716B CN201910646637.0A CN201910646637A CN110342716B CN 110342716 B CN110342716 B CN 110342716B CN 201910646637 A CN201910646637 A CN 201910646637A CN 110342716 B CN110342716 B CN 110342716B
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- heat exchange
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- exchange device
- waste water
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- 239000002351 wastewater Substances 0.000 title claims abstract description 68
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 47
- 230000003009 desulfurizing Effects 0.000 title claims abstract description 47
- 238000002425 crystallisation Methods 0.000 claims abstract description 49
- 230000005712 crystallization Effects 0.000 claims abstract description 49
- 238000010521 absorption reaction Methods 0.000 claims abstract description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000003546 flue gas Substances 0.000 claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 150000003839 salts Chemical class 0.000 claims abstract description 6
- 239000011780 sodium chloride Substances 0.000 claims abstract description 6
- 239000002244 precipitate Substances 0.000 claims abstract description 4
- 239000006228 supernatant Substances 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 210000004940 Nucleus Anatomy 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 abstract description 19
- 238000011084 recovery Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L Calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000001112 coagulant Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- GBAOBIBJACZTNA-UHFFFAOYSA-L Calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 235000010261 calcium sulphite Nutrition 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000005591 charge neutralization Effects 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001264 neutralization Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1425—Regeneration of liquid absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
Abstract
The invention relates to a coal-fired plant desulfurization wastewater zero discharge system, which comprises an original flue, an evaporation crystallization heat exchange device, a cyclone separator, an absorption tower, a crystallization tank and a centrifugal separator, wherein a flue gas inlet of the absorption tower is communicated with the original flue, the evaporation crystallization heat exchange device is arranged on the original flue, a desulfurization wastewater outlet of the absorption tower is communicated with a wastewater inlet of the evaporation crystallization heat exchange device, an outlet of the cyclone separator is communicated with a wastewater inlet of the crystallization tank, a supernatant outlet of the crystallization tank is communicated with the wastewater inlet of the evaporation crystallization heat exchange device through a return pipe, a precipitate outlet of the crystallization tank is communicated with a sample inlet of the centrifugal separator, and a liquid outlet of the centrifugal separator is communicated with the return pipe. The coal-fired plant desulfurization wastewater zero-discharge system provided by the technical scheme can effectively solve the problems of high operation cost and unstable system operation of the existing zero-discharge treatment method, and can effectively realize zero discharge of desulfurization wastewater and recovery of evaporated condensate water and crystallized salt.
Description
Technical Field
The invention relates to the technical field of wastewater discharge, in particular to a coal-fired plant desulfurization wastewater zero-discharge system.
Background
Limestone-gypsum wet flue gas desulfurization is the most widely applied and technically mature flue gas desulfurization process technology in the world at present. In order to ensure the normal operation of the desulfurization system, the content of chloride ions in the system is controlled within a reasonable concentration range, and a certain amount of desulfurization wastewater must be discharged. The pH value of the desulfurization wastewater is 4-6, the desulfurization wastewater has the characteristics of high concentration of suspended matters (mainly desulfurization products such As calcium sulfate, calcium sulfite and the like and dust), high salinity, high hardness, high corrosivity and the like, and also contains heavy metal ions such As Hg, Pb, As, Cd, Se and the like. And because of the change of factors such as coal-fired composition, combustion condition and limestone quality, its water quality and water yield all have instability. The conventional treatment process of the desulfurization wastewater generally adopts a coagulating sedimentation method (commonly called a triple box process), namely four steps of neutralization, sedimentation, flocculation and clarification, and the effluent quality can meet the requirements of limestone-gypsum wet desulfurization wastewater quality control index of thermal power plants (DL/T997-2006), but still has high salt content、Cl-、F-High content, and the like, and the direct discharge can cause secondary pollution and can not meet the increasingly strict environmental protection requirements at present. The traditional extensive discharge modes such as coal yard spraying, ash yard spraying, hydraulic slag flushing and the like are gradually stopped from the aspect of national policies. Therefore, in recent years, zero-emission treatment of desulfurization waste water has attracted more and more attention.
At present, the zero discharge treatment of desulfurization wastewater can be generally divided into two main categories of direct evaporation and pretreatment plus evaporative crystallization. The direct evaporation is carried out by methods such as an evaporation tank, flue spray evaporation and the like, the pretreatment is carried out by methods such as a coagulating sedimentation method, softening, concentrating and the like, and the methods can be used jointly or independently according to requirements; the evaporative crystallization comprises multiple-effect evaporation, mechanical vapor recompression evaporation and the like. But the problems of high operation cost and unstable system operation generally exist. Therefore, it is necessary to design a new technical solution to comprehensively solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide a zero discharge system for desulfurization wastewater of a coal-fired plant, which can effectively solve the problems of high operation cost and unstable system operation of the conventional zero discharge treatment method and can effectively realize zero discharge of desulfurization wastewater and recovery of condensed water and crystallized salt after evaporation.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a coal-fired plant desulfurization waste water zero release system, includes former flue, evaporation crystallization heat transfer device, cyclone, absorption tower, crystallizer and centrifuge, the flue gas entry of absorption tower with former flue is linked together, evaporation crystallization heat transfer device sets up on the former flue, the desulfurization waste water export of absorption tower is linked together with evaporation crystallization heat transfer device's waste water entry, cyclone's export with the waste water entry of crystallizer is linked together, the supernatant export of crystallizer is linked together through back flow and evaporation crystallization heat transfer device's waste water entry, the precipitate export of crystallizer with centrifuge's introduction port is linked together, centrifuge's liquid outlet with the back flow is linked together.
Preferably, the evaporative crystallization heat exchange device comprises a heat exchange tube, and the diameter of the heat exchange tube is gradually increased from the original flue end to the cyclone separator end.
Coal-fired plant desulfurization waste water zero discharge system that provides among the above-mentioned technical scheme, it evaporates crystallization heat transfer device to set up on former flue to get into at former flue gas, the desulfurization waste water that gets rid of the suspended solid gets into in evaporating crystallization heat transfer device from evaporating crystallization heat transfer device's waste water entry through the waste water conveyer pipe from the desulfurization waste water export of absorption tower, utilize evaporation crystallization heat transfer device with the dust remover export, absorption tower entry flue gas waste heat is used for the evaporative crystallization of desulfurization waste water to handle, the waste water export that crystal and concentrated desulfurization waste water pass through cyclone bottom gets into the crystallizer, get into the absorption tower from the flue gas entry of absorption tower after former flue gas temperature reduces and realize SO tower2Removing; the coal-fired plant desulfurization wastewater zero-discharge system provided by the invention effectively realizes desulfurization wastewater zero discharge and recovery of condensed water and crystallized salt after evaporation, and meanwhile, the process route is simple, the operation and maintenance cost is low, and the operation is reliable and stable.
Drawings
FIG. 1 is a schematic view of a zero discharge system of desulfurization wastewater of a coal-fired plant according to the present invention.
In the figure: 1. a fan; 2. an original flue; 3. a cyclone separator; 4. a crystallization tank; 5. a centrifugal separator; 6. a circulation pump; 7. a return pipe; 8. an absorption tower; 9. a waste water pump; 10. an evaporative crystallization heat exchange device; 11. a heat exchange tube.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the following description is given in conjunction with the accompanying examples. It is to be understood that the following text is merely illustrative of one or more specific embodiments of the invention and does not strictly limit the scope of the invention as specifically claimed.
The technical scheme adopted by the invention is shown in figure 1, and the zero discharge system of desulfurization waste water in a coal-fired plant comprises an original flue 2, an evaporative crystallization heat exchange device 10 and a cyclone separator 3, the device comprises an absorption tower 8, a crystallization tank 4 and a centrifugal separator 5, wherein a flue gas inlet of the absorption tower 8 is communicated with an original flue 2, an evaporative crystallization heat exchange device 10 is arranged on the original flue 2, a desulfurization waste water outlet of the absorption tower 8 is communicated with a waste water inlet of the evaporative crystallization heat exchange device 10 through a waste water pump 9, an outlet of a cyclone separator 3 is communicated with a waste water inlet of the crystallization tank 4, a supernatant outlet of the crystallization tank 4 is communicated with a waste water inlet of the evaporative crystallization heat exchange device 10 through a return pipe 7, a precipitate outlet of the crystallization tank 4 is communicated with a sample inlet of the centrifugal separator 5, a liquid outlet of the centrifugal separator 5 is communicated with the return pipe 7, and a circulating pump 6 is arranged on the return pipe 7; the evaporative crystallization heat exchange device 10 comprises a heat exchange tube 11, and the diameter of the heat exchange tube 11 is gradually increased from the original flue 2 end to the cyclone separator 3 end. The method comprises the following steps that raw flue gas is sent into a raw flue 2 by a fan 1, the raw flue gas enters a heat exchanger of an evaporative crystallization heat exchange device 10, desulfurization waste water enters a heat exchange pipe 11 from a nozzle with the smallest pipe diameter and uniformly distributed on the periphery of a pipeline, liquid drops are atomized and accelerated by high-speed airflow, heat transfer between the gas and the liquid is accelerated, moisture in the desulfurization waste water is rapidly evaporated into steam, salt is concentrated, and evaporative crystallization of the waste water is realized; meanwhile, along with the increase of the pipe diameter of the heat exchange pipe 11, the air flow velocity is reduced and the pressure is increased again, so that the condensation speed of crystallized particles as condensation nuclei is increased, and liquid drops with larger diameter are formed so as to be conveniently captured by the cyclone separator 3; the gas containing water vapor is defoamed by the cyclone 3 and is discharged from a gas outlet at the top of the cyclone 3.
The principle of the desulfurization wastewater zero-discharge system of the coal-fired plant provided by the invention is as follows: raw flue gas enters a heat exchange pipe of an evaporative crystallization heat exchange device arranged on a raw flue, desulfurization waste water for removing suspended matters enters the evaporative crystallization heat exchange device from a waste water inlet of the evaporative crystallization heat exchange device through a waste water conveying pipe from a desulfurization waste water outlet of an absorption tower, the raw flue gas replaces heat for the desulfurization waste water, the desulfurization waste water is evaporated and crystallized, crystals and concentrated desulfurization waste water enter a crystallization tank through a waste water outlet at the bottom of a cyclone separator, and the raw flue gas enters the absorption tower from a flue gas inlet of the absorption tower after the temperature of the raw flue gas is reduced to realize SO2And (4) removing.
The present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent changes and substitutions without departing from the principle of the present invention after learning the content of the present invention, and these equivalent changes and substitutions should be considered as belonging to the protection scope of the present invention.
Claims (3)
1. The utility model provides a coal-fired plant desulfurization waste water zero release system which characterized in that: the device comprises an original flue, an evaporative crystallization heat exchange device, a cyclone separator, an absorption tower, a crystallization tank and a centrifugal separator, wherein a flue gas inlet of the absorption tower is communicated with the original flue, the evaporative crystallization heat exchange device is arranged on the original flue, a desulfurization wastewater outlet of the absorption tower is communicated with a wastewater inlet of the evaporative crystallization heat exchange device, an outlet of the cyclone separator is communicated with a wastewater inlet of the crystallization tank, a supernatant outlet of the crystallization tank is communicated with the wastewater inlet of the evaporative crystallization heat exchange device through a return pipe, a precipitate outlet of the crystallization tank is communicated with a sample inlet of the centrifugal separator, and a liquid outlet of the centrifugal separator is communicated with the return pipe; the evaporative crystallization heat exchange device comprises a heat exchange tube, and the diameter of the heat exchange tube is gradually increased from the original flue end to the cyclone separator end;
the method comprises the following steps that raw flue gas is sent into a raw flue by a fan, the raw flue gas enters a heat exchanger of an evaporative crystallization heat exchange device, desulfurization waste water enters the heat exchange tube from nozzles uniformly distributed on the periphery of a pipeline with the smallest pipe diameter, liquid drops are atomized and accelerated by high-speed airflow, heat transfer between the gas and the liquid is accelerated, moisture in the desulfurization waste water is rapidly evaporated into steam, salt is concentrated, and evaporative crystallization of the waste water is realized; meanwhile, along with the increase of the pipe diameter of the heat exchange pipe, the air flow velocity is reduced and the pressure is increased again, so that the condensation speed of crystallized particles as condensation nuclei is increased, and liquid drops with larger diameters are formed so as to be conveniently collected by the cyclone separator; the gas containing the water vapor is subjected to de-entrainment through the cyclone separator and is discharged from a gas outlet at the top of the cyclone separator.
2. The coal-fired plant desulfurization wastewater zero-discharge system according to claim 1, characterized in that: the return pipe is provided with a circulating pump.
3. The coal-fired plant desulfurization wastewater zero-discharge system according to claim 1, characterized in that: and a wastewater pump is arranged between the desulfurization wastewater outlet of the absorption tower and the wastewater inlet of the evaporative crystallization heat exchange device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910646637.0A CN110342716B (en) | 2019-07-17 | 2019-07-17 | Zero discharge system of desulfurization waste water of coal-fired plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910646637.0A CN110342716B (en) | 2019-07-17 | 2019-07-17 | Zero discharge system of desulfurization waste water of coal-fired plant |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110342716A CN110342716A (en) | 2019-10-18 |
| CN110342716B true CN110342716B (en) | 2022-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910646637.0A Active CN110342716B (en) | 2019-07-17 | 2019-07-17 | Zero discharge system of desulfurization waste water of coal-fired plant |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998030312A1 (en) * | 1995-06-21 | 1998-07-16 | Huovilainen Reino T | Method and device for purification of smoke and process gases |
| CN203550673U (en) * | 2013-08-01 | 2014-04-16 | 宁波大学 | Evaporative cooler |
| CN105645491A (en) * | 2016-01-19 | 2016-06-08 | 北京科清环保科技有限公司 | Water purification system and process |
| EP3050852A1 (en) * | 2015-01-29 | 2016-08-03 | Omya International AG | Process for manufacturing a solution of an earth alkali hydrogen carbonate |
| CN206424722U (en) * | 2016-11-29 | 2017-08-22 | 中国石油化工股份有限公司 | A kind of processing unit of sodium method flue gas desulphurization waste solution |
| CN107596883A (en) * | 2017-09-22 | 2018-01-19 | 华电电力科学研究院 | A kind of desulfurization wastewater Zero discharging system and its method of work |
| CN108744565A (en) * | 2018-07-31 | 2018-11-06 | 中国大唐集团科学技术研究院有限公司西北分公司 | A kind of evaporative crystallization heat-exchanger rig and coal fired plant desulfurization wastewater Zero discharging system |
-
2019
- 2019-07-17 CN CN201910646637.0A patent/CN110342716B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998030312A1 (en) * | 1995-06-21 | 1998-07-16 | Huovilainen Reino T | Method and device for purification of smoke and process gases |
| CN203550673U (en) * | 2013-08-01 | 2014-04-16 | 宁波大学 | Evaporative cooler |
| EP3050852A1 (en) * | 2015-01-29 | 2016-08-03 | Omya International AG | Process for manufacturing a solution of an earth alkali hydrogen carbonate |
| CN105645491A (en) * | 2016-01-19 | 2016-06-08 | 北京科清环保科技有限公司 | Water purification system and process |
| CN206424722U (en) * | 2016-11-29 | 2017-08-22 | 中国石油化工股份有限公司 | A kind of processing unit of sodium method flue gas desulphurization waste solution |
| CN107596883A (en) * | 2017-09-22 | 2018-01-19 | 华电电力科学研究院 | A kind of desulfurization wastewater Zero discharging system and its method of work |
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| CN110342716A (en) | 2019-10-18 |
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